Merge branch 'develop' of github.com:EllisLab/CodeIgniter into develop

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+##########
+Field Data
+##########
+
+$this->db->list_fields()
+=========================
+
+Returns an array containing the field names. This query can be called
+two ways:
+
+1. You can supply the table name and call it from the $this->db->
+object::
+
+	 $fields = $this->db->list_fields('table_name');  foreach ($fields as $field) {    echo $field; }
+
+2. You can gather the field names associated with any query you run by
+calling the function from your query result object::
+
+	 $query = $this->db->query('SELECT * FROM some_table');   foreach ($query->list_fields() as $field) {    echo $field; }
+
+$this->db->field_exists()
+==========================
+
+Sometimes it's helpful to know whether a particular field exists before
+performing an action. Returns a boolean TRUE/FALSE. Usage example::
+
+	 if ($this->db->field_exists('field_name', 'table_name')) {    // some code... }
+
+Note: Replace *field_name* with the name of the column you are looking
+for, and replace *table_name* with the name of the table you are
+looking for.
+
+$this->db->field_data()
+========================
+
+Returns an array of objects containing field information.
+
+Sometimes it's helpful to gather the field names or other metadata, like
+the column type, max length, etc.
+
+Note: Not all databases provide meta-data.
+
+Usage example::
+
+	 $fields = $this->db->field_data('table_name');  foreach ($fields as $field) {    echo $field->name;    echo $field->type;    echo $field->max_length;    echo $field->primary_key; }
+
+If you have run a query already you can use the result object instead of
+supplying the table name::
+
+	 $query = $this->db->query("YOUR QUERY"); $fields = $query->field_data();
+
+The following data is available from this function if supported by your
+database:
+
+-  name - column name
+-  max_length - maximum length of the column
+-  primary_key - 1 if the column is a primary key
+-  type - the type of the column
+